<template>
  <div class="login_container">
     <div class="login_box">
       <!-- 头像区域 -->
         <div class="avatar_box">
             <img src="../assets/logo.png">
         </div>
       <!-- 登录表单区域 -->
       <el-form ref="loginFormRef" :model="loginForm" :rules="loginFromRules" class="login_form">
         <!--用户名-->
         <el-form-item prop="username" >
           <el-input  v-model="loginForm.username" prefix-icon="el-icon-user" ></el-input>
         </el-form-item>
         <!--密码-->
         <el-form-item prop="password" >
           <el-input  type="password" v-model="loginForm.password" prefix-icon="el-icon-lock" ></el-input>
         </el-form-item>
         <!--按钮区域-->
         <el-form-item class="btns">
           <el-button type="primary" @click="login" >登录</el-button>
           <el-button type="info" @click="resetLoginForm">重置</el-button>
         </el-form-item>
       </el-form>
     </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: '',
        password: ''
      },
      loginFromRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 4, max: 15, message: '长度在 4 到 15 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 4, max: 15, message: '长度在 4 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置表单函数
    resetLoginForm () {
      // 重置表单
      this.$refs.loginFormRef.resetFields()
    },
    // 表单预验证
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1.将登录成功之后的token,保存在客户端的sessionStorage(当前会话打开时生效)中
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转到后台 /home
        this.$router.push('/home')
      })
    }
  }

}
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
     width: 450px;
     height: 300px;
     background-color: white;
     border-radius: 3px;
     position: absolute;
     left: 50%;
     top:50%;
     transform: translate(-50%,-50%);
  }
  .avatar_box{
     height: 130px;
     width: 130px;
     border:  1px solid #eee;
     border-radius: 50%;
     padding:10px;
     box-shadow: 0 0 10px #ddd;
     position: absolute;
     left: 50%;
     transform: translate(-50%,-50%);
     background-color: #fff;
     img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
     }
  }
  .btns{
     display: flex;
     justify-content: flex-end;
  }
  .login_form{
     position: absolute;
     bottom: 0px;
     width: 100%;
     padding: 0 20px;
     box-sizing: border-box;
  }
</style>
